GB1249497A – Apparatus for automatically eliminating an influence of the earth’s magnetic field on colour television receivers
– Google Patents
GB1249497A – Apparatus for automatically eliminating an influence of the earth’s magnetic field on colour television receivers
– Google Patents
Apparatus for automatically eliminating an influence of the earth’s magnetic field on colour television receivers
Info
Publication number
GB1249497A
GB1249497A
GB6167068A
GB6167068A
GB1249497A
GB 1249497 A
GB1249497 A
GB 1249497A
GB 6167068 A
GB6167068 A
GB 6167068A
GB 6167068 A
GB6167068 A
GB 6167068A
GB 1249497 A
GB1249497 A
GB 1249497A
Authority
GB
United Kingdom
Prior art keywords
magnetic field
earth
arrangement
bridge
amplifiers
Prior art date
1967-12-29
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6167068A
Inventor
Tetsuo Tokita
Junji Inagawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1967-12-29
Filing date
1968-12-30
Publication date
1971-10-13
1968-12-30
Application filed by Sony Corp
filed
Critical
Sony Corp
1971-10-13
Publication of GB1249497A
publication
Critical
patent/GB1249497A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
230000004907
flux
Effects
0.000
abstract
1
239000000463
material
Substances
0.000
abstract
1
238000006386
neutralization reaction
Methods
0.000
abstract
1
230000003472
neutralizing effect
Effects
0.000
abstract
1
230000006798
recombination
Effects
0.000
abstract
1
238000005215
recombination
Methods
0.000
abstract
1
239000004065
semiconductor
Substances
0.000
abstract
1
230000035945
sensitivity
Effects
0.000
abstract
1
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N9/00—Details of colour television systems
H04N9/12—Picture reproducers
H04N9/16—Picture reproducers using cathode ray tubes
H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields
G—PHYSICS
G01—MEASURING; TESTING
G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R33/00—Arrangements or instruments for measuring magnetic variables
G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
G01R33/09—Magnetoresistive devices
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
Abstract
1,249,497. Cathode-ray tube circuits. SONY CORP. 30 Dec., 1968 [29 Dec., 1967; 2 March, 1968], No. 61670/68. Heading H4T. In an arrangement for automatically eliminating the influence of the earth’s magnetic field on the cathode-ray tube in colour television receivers means are provided for detecting such field and for producing an output voltage which is utilized to control a proportional current in a coil positioned in relation to the tube such that the magnetic field produced thereby neutralizes that due to the earth’s field. The means for detecting the earth’s magnetic field comprises a magneto-resistance element formed from semi-conductor material SCM (Fig. 1) and consists of a high resistance region I, P and N regions and a recombination region F. This element has a voltage current characteristic A2 (Fig. 2) in the presence of a magnetic field (+ ) H acting in the direction shown by the arrow and at right angles to the current paths in the element and a characteristic A3 when the direction of the field is reversed (- H), so that the magnetic field resistance characteristic is as shown in Fig. 3. In carrying out the invention two such elements connected in series, in the forward direction, may be employed (Figs. 5A and 5B, not shown) but, preferably, and as shown in Figs. 7A and 7B two such series connected pairs SCM 1 … SCM 4 formed as a bridge circuit and operating differentially are employed. In the arrangement of Fig. 7A, a D.C. bias source E I is utilized and the output of the bridge is amplified in D.C. amplifiers DA 1 , DA 2 feeding opposite ends of the neutralizing coil LT. In the arrangement of Fig. 7B an A.C. bias source comprising, e.g. a sine wave or the line or frame pulse voltages available in the television receiver, is employed and the bridge output is amplified in A.C. amplifiers 12 1 , 12 2 , rectified by diodes 17 1 , 17 2 and further amplified by D.C. amplifiers 18 1 , 18 3 feeding the coil LT. In practice three such bridge-connected elements are employed. These are positioned with the angular relationship shown in Fig. 8A, the output of the bridge ST controlling the current in a coil LT surrounding the screen end of the tube CT whilst the outputs of the bridges SL and SR control the current in coils LL 1 , LL 2 and LR 1 , LR 2 positioned at the top and bottom of the left and right-hand sides of the screen. With this arrangement currents having relative phases -45‹, 0‹, +45‹ are produced in the coils LL, LT and LR respectively and when once set up, with suitable adjustment of the gains of the D.C. amplifiers, neutralization of the earth’s magnetic field is produced irrespective of changes in the orientation of the receiver. The sensitivity of the arrangement may be enhanced by the use of flux collectors on both sides of the elements of the bridges (Fig. 11, not shown).
GB6167068A
1967-12-29
1968-12-30
Apparatus for automatically eliminating an influence of the earth’s magnetic field on colour television receivers
Expired
GB1249497A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
JP11046667
1967-12-29
JP1616068
1968-03-02
Publications (1)
Publication Number
Publication Date
GB1249497A
true
GB1249497A
(en)
1971-10-13
Family
ID=26352425
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB6167068A
Expired
GB1249497A
(en)
1967-12-29
1968-12-30
Apparatus for automatically eliminating an influence of the earth’s magnetic field on colour television receivers
Country Status (4)
Country
Link
DE
(1)
DE1817464A1
(en)
FR
(1)
FR1600004A
(en)
GB
(1)
GB1249497A
(en)
NL
(2)
NL163404C
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US5179315A
(en)
*
1990-06-08
1993-01-12
U.S. Philips Corporation
Circuit for the compensation of the horizontal component of the earth’s magnetic field for a color picture tube of a high-resolution monitor
EP0675339A1
(en)
*
1994-03-28
1995-10-04
Sony Corporation
Geomagnetic direction sensor
Families Citing this family (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3017331A1
(en)
*
1980-05-06
1981-11-12
Siemens AG, 1000 Berlin und 8000 München
ARRANGEMENT FOR COMPENSATING FOR MAGNETIC FOREIGN INTERFERENCE ON COLOR TV TELEVISIONS
JPS61161093A
(en)
*
1985-01-09
1986-07-21
Sony Corp
Device for correcting dynamic uniformity
JPH02206297A
(en)
*
1989-02-06
1990-08-16
Mitsubishi Electric Corp
Magnetism canceling device for color cathode ray tube
DE9413937U1
(en)
*
1994-08-31
1994-12-01
Fischer Hans Peter
Transport box for glasses
1968
1968-12-27
FR
FR1600004D
patent/FR1600004A/fr
not_active
Expired
1968-12-30
NL
NL6818834A
patent/NL163404C/en
not_active
IP Right Cessation
1968-12-30
GB
GB6167068A
patent/GB1249497A/en
not_active
Expired
1968-12-30
DE
DE19681817464
patent/DE1817464A1/en
active
Pending
1969
1969-02-28
NL
NL6903194A
patent/NL6903194A/xx
unknown
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US5179315A
(en)
*
1990-06-08
1993-01-12
U.S. Philips Corporation
Circuit for the compensation of the horizontal component of the earth’s magnetic field for a color picture tube of a high-resolution monitor
EP0675339A1
(en)
*
1994-03-28
1995-10-04
Sony Corporation
Geomagnetic direction sensor
US5982176A
(en)
*
1994-03-28
1999-11-09
Sony Corporation
Geomagnetic direction sensor
Also Published As
Publication number
Publication date
NL6818834A
(en)
1969-07-01
DE1817464A1
(en)
1969-08-14
NL163404C
(en)
1980-08-15
FR1600004A
(en)
1970-07-20
NL163404B
(en)
1980-03-17
NL6903194A
(en)
1969-09-04
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